Flexible and Densely Packed π-Figuration System: Creating Elastic Organic Crystals of π-Conjugated Molecules

2020 ◽  
Vol 78 (10) ◽  
pp. 962-970
Author(s):  
Shotaro Hayashi
Keyword(s):  
Organic Crystals ◽  
Conjugated Molecules

scholarly journals Elastic Organic Crystals of π-Conjugated Molecules: New Concept for Materials Chemistry

Symmetry ◽  
2020 ◽  
Vol 12 (12) ◽  
pp. 2022
Author(s):  
Shotaro Hayashi
Keyword(s):  
Small Molecules ◽  
Single Crystals ◽  
State Of The Art ◽  
Functional Materials ◽  
Molecular Structures ◽  
Organic Crystal ◽  
Organic Crystals ◽  
Materials Chemistry ◽  
Conjugated Molecules ◽  
Recent Emergence

It is generally believed that organic single crystals composed of a densely packed arrangement of anisotropic, organic small molecules are less useful as functional materials due to their mechanically inflexible and brittle nature, compared to polymers bearing flexible chains and thereby exhibiting viscoelasticity. Nevertheless, organic crystals have attracted much attention because of their tunable optoelectronic properties and a variety of elegant crystal habits and unique ordered or disordered molecular packings arising from the anisotropic molecular structures. However, the recent emergence of flexible organic crystal materials showing plasticity and elasticity has considerably changed the concept of organic single crystals. In this review, the author summarizes the state-of-the-art development of flexible organic crystal materials, especially functional elastic organic crystals which are expected to provide a foothold for the next generation of organic crystal materials.

Creating Elastic Organic Crystals of π-Conjugated Molecules with Bending Mechanofluorochromism and Flexible Optical Waveguide

2018 ◽  
Vol 57 (52) ◽  
pp. 17002-17008 ◽  
Author(s):  
Shotaro Hayashi ◽  
Shun-ya Yamamoto ◽  
Daisuke Takeuchi ◽  
Yutaka Ie ◽  
Koji Takagi
Keyword(s):  
Optical Waveguide ◽  
Organic Crystals ◽  
Conjugated Molecules

Creating Elastic Organic Crystals of π-Conjugated Molecules with Bending Mechanofluorochromism and Flexible Optical Waveguide

2018 ◽  
Vol 130 (52) ◽  
pp. 17248-17254 ◽  
Author(s):  
Shotaro Hayashi ◽  
Shun-ya Yamamoto ◽  
Daisuke Takeuchi ◽  
Yutaka Ie ◽  
Koji Takagi
Keyword(s):  
Optical Waveguide ◽  
Organic Crystals ◽  
Conjugated Molecules

scholarly journals Innentitelbild: Creating Elastic Organic Crystals of π-Conjugated Molecules with Bending Mechanofluorochromism and Flexible Optical Waveguide (Angew. Chem. 52/2018)

2018 ◽  
Vol 130 (52) ◽  
pp. 17154-17154
Author(s):  
Shotaro Hayashi ◽  
Shun-ya Yamamoto ◽  
Daisuke Takeuchi ◽  
Yutaka Ie ◽  
Koji Takagi
Keyword(s):  
Optical Waveguide ◽  
Organic Crystals ◽  
Conjugated Molecules

Interpretation of irradiation-induced changes in electron diffractograms and images of extinction contours at low temperatures

1984 ◽  
Vol 42 ◽  
pp. 268-269
Author(s):  
E. Knapek ◽  
H. Formanek ◽  
G. Lefranc ◽  
I. Dietrich
Keyword(s):  
Low Temperatures ◽  
Carbon Films ◽  
Organic Crystals ◽  
Wide Spread ◽  
Lens System ◽  
Preparation Conditions ◽  
Thin Carbon ◽  
Electron Diffractograms ◽  
Diffraction Patterns ◽  
Induced Changes

A few years ago results on cryoprotection of L-valine were reported, where the values of the critical fluence De i.e, the electron exposure which decreases the intensity of the diffraction reflections by a factor e, amounted to the order of 2000 + 1000 e/nm2. In the meantime a discrepancy arose, since several groups published De values between 100 e/nm2 and 1200 e/nm2 /1 - 4/. This disagreement and particularly the wide spread of the results induced us to investigate more thoroughly the behaviour of organic crystals at very low temperatures during electron irradiation.For this purpose large L-valine crystals with homogenuous thickness were deposited on holey carbon films, thin carbon films or Au-coated holey carbon films. These specimens were cooled down to nearly liquid helium temperature in an electron microscope with a superconducting lens system and irradiated with 200 keU-electrons. The progress of radiation damage under different preparation conditions has been observed with series of electron diffraction patterns and direct images of extinction contours.

Visualization and Manipulation of Molecular Motion in Solid State through Photo-Induced Clusteroluminescence

2019 ◽  
Author(s):  
Haoke Zhang ◽  
Lili Du ◽  
Lin Wang ◽  
Junkai Liu ◽  
Qing Wan ◽  
...  
Keyword(s):  
Quantum Mechanics ◽  
Excited State ◽  
Solid State ◽  
Light Source ◽  
Molecular Motion ◽  
Molecular Machine ◽  
Conjugated Molecules ◽  
Time Resolved ◽  
Packing Structure ◽  
New Strategy

<p>Building molecular machine has long been a dream of scientists as it is expected to revolutionize many aspects of technology and medicine. Implementing the solid-state molecular motion is the prerequisite for a practical molecular machine. However, few works on solid-state molecular motion have been reported and it is almost impossible to “see” the motion even if it happens. Here the light-driven molecular motion in solid state is discovered in two non-conjugated molecules <i>s</i>-DPE and <i>s</i>-DPE-TM, resulting in the formation of excited-state though-space complex (ESTSC). Meanwhile, the newly formed ESTSC generates an abnormal visible emission which is termed as clusteroluminescence. Notably, the original packing structure can recover from ESTSC when the light source is removed. These processes have been confirmed by time-resolved spectroscopy and quantum mechanics calculation. This work provides a new strategy to manipulate and “see” solid-state molecular motion and gains new insights into the mechanistic picture of clusteroluminescence.<br></p>

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